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122 lines
2.6 KiB
122 lines
2.6 KiB
/* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file "COPYING" in the main directory of this archive |
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* for more details. |
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* |
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* Copyright (C) 2005 MIPS Technologies, Inc. All rights reserved. |
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* Copyright (C) 2013 Imagination Technologies Ltd. |
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*/ |
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#include <linux/device.h> |
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#include <linux/fs.h> |
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#include <linux/err.h> |
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#include <linux/wait.h> |
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#include <linux/sched.h> |
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#include <linux/smp.h> |
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#include <asm/mips_mt.h> |
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#include <asm/vpe.h> |
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#include <asm/rtlx.h> |
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static int major; |
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static void rtlx_interrupt(void) |
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{ |
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int i; |
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struct rtlx_info *info; |
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struct rtlx_info **p = vpe_get_shared(aprp_cpu_index()); |
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if (p == NULL || *p == NULL) |
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return; |
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info = *p; |
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if (info->ap_int_pending == 1 && smp_processor_id() == 0) { |
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for (i = 0; i < RTLX_CHANNELS; i++) { |
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wake_up(&channel_wqs[i].lx_queue); |
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wake_up(&channel_wqs[i].rt_queue); |
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} |
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info->ap_int_pending = 0; |
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} |
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} |
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void _interrupt_sp(void) |
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{ |
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smp_send_reschedule(aprp_cpu_index()); |
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} |
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int __init rtlx_module_init(void) |
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{ |
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struct device *dev; |
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int i, err; |
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if (!cpu_has_mipsmt) { |
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pr_warn("VPE loader: not a MIPS MT capable processor\n"); |
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return -ENODEV; |
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} |
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if (num_possible_cpus() - aprp_cpu_index() < 1) { |
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pr_warn("No TCs reserved for AP/SP, not initializing RTLX.\n" |
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"Pass maxcpus=<n> argument as kernel argument\n"); |
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return -ENODEV; |
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} |
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major = register_chrdev(0, RTLX_MODULE_NAME, &rtlx_fops); |
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if (major < 0) { |
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pr_err("rtlx_module_init: unable to register device\n"); |
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return major; |
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} |
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/* initialise the wait queues */ |
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for (i = 0; i < RTLX_CHANNELS; i++) { |
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init_waitqueue_head(&channel_wqs[i].rt_queue); |
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init_waitqueue_head(&channel_wqs[i].lx_queue); |
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atomic_set(&channel_wqs[i].in_open, 0); |
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mutex_init(&channel_wqs[i].mutex); |
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dev = device_create(mt_class, NULL, MKDEV(major, i), NULL, |
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"%s%d", RTLX_MODULE_NAME, i); |
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if (IS_ERR(dev)) { |
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while (i--) |
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device_destroy(mt_class, MKDEV(major, i)); |
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err = PTR_ERR(dev); |
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goto out_chrdev; |
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} |
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} |
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/* set up notifiers */ |
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rtlx_notify.start = rtlx_starting; |
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rtlx_notify.stop = rtlx_stopping; |
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vpe_notify(aprp_cpu_index(), &rtlx_notify); |
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if (cpu_has_vint) { |
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aprp_hook = rtlx_interrupt; |
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} else { |
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pr_err("APRP RTLX init on non-vectored-interrupt processor\n"); |
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err = -ENODEV; |
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goto out_class; |
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} |
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return 0; |
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out_class: |
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for (i = 0; i < RTLX_CHANNELS; i++) |
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device_destroy(mt_class, MKDEV(major, i)); |
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out_chrdev: |
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unregister_chrdev(major, RTLX_MODULE_NAME); |
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return err; |
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} |
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void __exit rtlx_module_exit(void) |
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{ |
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int i; |
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for (i = 0; i < RTLX_CHANNELS; i++) |
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device_destroy(mt_class, MKDEV(major, i)); |
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unregister_chrdev(major, RTLX_MODULE_NAME); |
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aprp_hook = NULL; |
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}
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